Harry Potter's wand is indeed made of holly wood with a phoenix feather core, and measures 11 inches. The phoenix feather came from Fawkes, Dumbledore's phoenix. Option C correctly states all three components: holly wood, phoenix feather core, and 11-inch length. Options A and B are incorrect because they either omit the wood type or get the length wrong. Option D has the correct materials but wrong length (12 inches instead of 11).